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#pragma once
#include "drape/dynamic_texture.hpp"
#include "drape/glyph_generator.hpp"
#include "drape/glyph_manager.hpp"
#include "drape/pointers.hpp"
#include <atomic>
#include <map>
#include <memory>
#include <mutex>
#include <vector>
namespace dp
{
class GlyphPacker
{
public:
explicit GlyphPacker(m2::PointU const & size);
bool PackGlyph(uint32_t width, uint32_t height, m2::RectU & rect);
bool CanBePacked(uint32_t glyphsCount, uint32_t width, uint32_t height) const;
m2::RectF MapTextureCoords(m2::RectU const & pixelRect) const;
bool IsFull() const;
m2::PointU const & GetSize() const { return m_size; }
private:
m2::PointU m_size = m2::PointU(0, 0);
m2::PointU m_cursor = m2::PointU(0, 0);
uint32_t m_yStep = 0;
bool m_isFull = false;
};
class GlyphKey : public Texture::Key
{
public:
GlyphKey(strings::UniChar unicodePoint, int fixedSize)
: m_unicodePoint(unicodePoint)
, m_fixedSize(fixedSize)
{}
Texture::ResourceType GetType() const { return Texture::ResourceType::Glyph; }
strings::UniChar GetUnicodePoint() const { return m_unicodePoint; }
int GetFixedSize() const { return m_fixedSize; }
bool operator<(GlyphKey const & g) const
{
if (m_unicodePoint == g.m_unicodePoint)
return m_fixedSize < g.m_fixedSize;
return m_unicodePoint < g.m_unicodePoint;
}
private:
strings::UniChar m_unicodePoint;
int m_fixedSize;
};
class GlyphInfo : public Texture::ResourceInfo
{
using Base = Texture::ResourceInfo;
public:
GlyphInfo(m2::RectF const & texRect, GlyphManager::GlyphMetrics const & metrics)
: Base(texRect)
, m_metrics(metrics)
{}
~GlyphInfo() override = default;
Texture::ResourceType GetType() const override { return Texture::ResourceType::Glyph; }
GlyphManager::GlyphMetrics const & GetMetrics() const { return m_metrics; }
private:
GlyphManager::GlyphMetrics m_metrics;
};
class GlyphIndex : public GlyphGenerator::Listener
{
public:
GlyphIndex(m2::PointU const & size, ref_ptr<GlyphManager> mng,
ref_ptr<GlyphGenerator> generator);
~GlyphIndex() override;
// This function can return nullptr.
ref_ptr<Texture::ResourceInfo> MapResource(GlyphKey const & key, bool & newResource);
std::vector<ref_ptr<Texture::ResourceInfo>> MapResources(std::vector<GlyphKey> const & keys,
bool & hasNewResources);
void UploadResources(ref_ptr<dp::GraphicsContext> context, ref_ptr<Texture> texture);
bool CanBeGlyphPacked(uint32_t glyphsCount) const;
uint32_t GetAbsentGlyphsCount(strings::UniString const & text, int fixedHeight) const;
// ONLY for unit-tests. DO NOT use this function anywhere else.
size_t GetPendingNodesCount();
private:
ref_ptr<Texture::ResourceInfo> MapResource(GlyphKey const & key, bool & newResource,
GlyphGenerator::GlyphGenerationData & generationData);
void OnCompleteGlyphGeneration(GlyphGenerator::GlyphGenerationDataArray && glyphs) override;
GlyphPacker m_packer;
ref_ptr<GlyphManager> m_mng;
ref_ptr<GlyphGenerator> m_generator;
using ResourceMapping = std::map<GlyphKey, GlyphInfo>;
using PendingNode = std::pair<m2::RectU, GlyphManager::Glyph>;
using PendingNodes = std::vector<PendingNode>;
ResourceMapping m_index;
PendingNodes m_pendingNodes;
std::mutex m_mutex;
};
class FontTexture : public DynamicTexture<GlyphIndex, GlyphKey, Texture::ResourceType::Glyph>
{
using TBase = DynamicTexture<GlyphIndex, GlyphKey, Texture::ResourceType::Glyph>;
public:
FontTexture(m2::PointU const & size, ref_ptr<GlyphManager> glyphMng,
ref_ptr<GlyphGenerator> glyphGenerator, ref_ptr<HWTextureAllocator> allocator)
: m_index(size, glyphMng, glyphGenerator)
{
TBase::DynamicTextureParams params{size, TextureFormat::Alpha,
TextureFilter::Linear, true /* m_usePixelBuffer */};
TBase::Init(allocator, make_ref(&m_index), params);
}
~FontTexture() override { TBase::Reset(); }
std::vector<ref_ptr<ResourceInfo>> FindResources(std::vector<GlyphKey> const & keys,
bool & hasNewResources)
{
ASSERT(m_indexer != nullptr, ());
return m_indexer->MapResources(keys, hasNewResources);
}
bool HasEnoughSpace(uint32_t newKeysCount) const override
{
return m_index.CanBeGlyphPacked(newKeysCount);
}
uint32_t GetAbsentGlyphsCount(strings::UniString const & text, int fixedHeight) const
{
return m_index.GetAbsentGlyphsCount(text, fixedHeight);
}
private:
GlyphIndex m_index;
};
} // namespace dp
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